> 1. I need to have 2 seprate indexes. In Stackoverlfow I
> became the answer I
> need to start 2 cores for example. How many cores can I run
> for solr? 

Please see : http://search-lucene.com/m/6rYti2ehFZ82


> I have for example jobs form country A, jobs from country B
> and so on until
> 100 countries. I need to have for each country an separate
> index, because if
> someone search for jobs in country A I need to query only
> the index for
> country A. How to solve this problem?
> How to do this? Is there are good tutorial? In the wiki of
> solr, it is very
> bad explained.

http://wiki.apache.org/solr/MultipleIndexes talks about different solutions. 
One big index with fq is an option too.

> 2. When I become new data for example: Should I rotate the
> whole index
> again, or can I include the new rows and delete the old
> rows. What is your
> suggestion?

I don't understand this. What do you mean by rotate the whole index?

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